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12.6 Special Relay List
12
TROUBLESHOOTING
(4) Safety CPU
(5) Boot operation
(6) Instruction-Related Special Relays
(7) CC-Link Safety
Table12.15 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM560
TEST MODE
flag
OFF : Other than TEST
MODE
ON : TEST MODE
• Turns ON when operating on the TEST
MODE.
• Turns OFF when operating on the other
mode (SAFETY MODE, SAFETY MODE
(wait-for-restart)).
S (Status change)
QS
SM561
Continuous
RUN of
tolerance time
setting for the
TEST MODE
OFF : Within the setting
time
ON : Over the setting
time
• Turns ON when the continuous RUN of
tolerance time set for the TEST MODE in the
parameter is exceeded.
S (Error)
Table12.16 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM660 Boot operation
OFF: Program memory
execution
ON : During boot
operation
(On the TEST MODE)
• Turns ON during the boot operation from
standard ROM.
• Turns OFF when the boot operation from
standard ROM is not run.
(On the SAFETY MODE)
• Always ON
S (Initial) QS
Table12.17 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM722
BIN/DBIN
instruction error
disabling flag
OFF : Error detection
performed
ON : Error detection not
performed
• Turned ON when "OPERATION ERROR" is
suppressed for BIN or DBIN instruction.
UQS
Table12.18 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM1004
Safety refresh
communication
status of each
safety remote
station
(Safety master
module 1)
OFF: Normal
ON : Communication
error
The safety station refresh communication
status is stored. (The status of each station are
stored in SD1004 to SD1007.)
S (Status change)
QS
SM1204
Safety refresh
communication
status of each
safety remote
station
(Safety master
module 2)
OFF: Normal
ON : Communication
error
The safety station refresh communication
status is stored. (The status of each station are
stored in SD1204 to SD1207.)
S (Status change)